10. Aldrich Ames Compromises U.S. Intelligence
Aldrich Ames, a high-ranking CIA officer, began spying for the Soviet Union in 1985. Over nine years, he provided the KGB with sensitive information, leading to the execution of at least ten American agents. His 1994 conviction highlighted the severe risks of espionage during the Cold War. For more details, visit the FBI’s account of the case. (fbi.gov)
